Backpack



FIG. 1 is a right side perspective view of a backpack showing my new design;

FIG. 2 is Front-side view of the backpack as shown in FIG. 1;

FIG. 3 is a Back-side view of the backpack as shown in FIG. 1;

FIG. 4 is a Left-side view of the backpack as shown in FIG. 1;

FIG. 5 is a Right-side view of the backpack as shown in FIG. 1;

FIG. 6 is a Top-side view of the backpack as shown in FIG. 1;

FIG. 7 is a Bottom-side view of the backpack as shown in FIG. 1; and,

FIG. 8 is a left side perspective view of the backpack as shown in FIG. 1.

The broken lines illustrate portions of the backpack and form no part of the claimed design. 

CLAIM I claim the ornamental design for a backpack, as shown and described. 